function writeCookie(name, value, days)
{
	var expries = "";
	if (days) {
		var date = new Date();
		date.setTime(date.getTime() + (days*24*60*60*1000));
		expries = "; expries=" + date.toGMTString();
	}
	document.cookie = name + "=" + value + expries + "; path=/";
}

function readCookie(name)
{
	var searchName = name + "=";
	var cookies = document.cookie.split(";");
	for(var i=0; i<cookies.length; i++){
		var c = cookies[i];
		while(c.charAt(0) == " ")
			c = c.substring(1,c.length);
		if(c.indexOf(searchName)==0)
			return c.substring(searchName.length,c.length);
	}
	return "";
}

function eraseCookie(name)
{
	writeCookie(name, "", -1);
}
